Abstract
Upon the exposure of KGM solution (1% w/v in water) to US at a relatively high power intensity (50 W/cm2), the apparent viscosity decreased rapidly from about 50 Pa s to a negligible level within 10–20 min. The intrinsic viscosity ([η]) of KGM solution decreased gradually during the US exposure with a time course closely fitted to the first-order polymer degradation kinetics (random chain scission). The US treatment also caused a significant reduction of particle size (Zavg) of KGM aggregates and changes in the rheological properties including the decrease of storage modulus (G′) and loss modulus (G″), and the increase in phase angle (tan δ = G″/G′). Nevertheless, no change in primary structure was detected by Fourier transformation infrared (FT-IR) analysis. The results suggested that high intensity US was an effective means for KGM degradation without significant structural destruction.
Original language | English |
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Pages (from-to) | 14-19 |
Number of pages | 6 |
Journal | Food Hydrocolloids |
Volume | 70 |
DOIs | |
Publication status | Published - 1 Sept 2017 |
Keywords
- Polysaccharide
- Rheological properties
- Ultrasonic degradation
ASJC Scopus subject areas
- Food Science
- General Chemistry
- General Chemical Engineering